Composition for polyurethane foaming, polyurethane foam and use thereof

Abstract

A composition for polyurethane foaming, a polyurethane foam and a use thereof. The composition contains two different polyols with a polyethylene oxide ether structure and a polypropylene oxide ether structure, and a specific type of catalyst, flame retardant and water are added thereto; at the same time, the composition contains a small amount of a surfactant and other small molecular alcohols. The traits of the product are that it is pale yellow and transparent, and the product is not layered during long-term storage. The above-mentioned composition and polyphenylpolymethylene polyisocyanate (PAPI) produce a low-density polyurethane foam by means of a foaming machine. The foam has a good thermal insulation effect and a high rate of yield, and the foam has a flame retardant property, that is to say, same can be used for construction insulation, and can also be used for packaging a buffer material, has a good thermal insulation, adhesion and dimensional stability, and has a low odor during the process of construction, the foaming agents all use water, and do not contain chlorofluorocarbon substances that destroy the ozone layer and climate.

Description

TECHNICAL FIELD[0001]The present invention relates to a composition for polyurethane foaming, a polyurethane foam and a use thereof, especially to a composition for low density, all-water-blown polyurethane foaming, a low density, all-water-blown polyurethane foam and a use thereof. The foam produced by the reaction between the composition of the present invention and polyphenylpolymethylene polyisocyanate (PAPI) can be used in the thermal insulation filling materials, thermal insulation, sound insulation, damp proof of buildings, and it can also be used for the packaging industry of precise instrument.TECHNICAL BACKGROUND[0002]Polyurethane foam plastic is a kind of foam material with high performance, the insulation property thereof is the best among other foam materials, at the same time, polyurethane foam plastic has good material strength. It is the best choice in the field of insulation such as refrigerator, solar energy, heat distribution pipeline, construction, automobiles an...

AI Technical Summary

Benefits of technology

The present invention provides a polyurethane foam with a low foam density (6-15 kg / m3) and an expansion ratio of up to 100 times. Compared to regular foam, the present foam requires less amount for insulation and has better dimensional stability, longer life, and stronger adhesion with the substrate. The composition can be used with any foaming sprayer or pouring machine on the market, and can be carried out under any weather condition above 15°C. The composition has good tolerance to construction conditions.

Problems solved by technology

The cost of HFC-245fa is too high, 365mfc and cyclopentane are flammable, thus they cannot be used for in situ spraying, and the flame retardance of the foam is poor.

All-water-blown polyurethane foaming compositions were already on the market, but they have many problems: the flame retardant in the formulae is not miscible with water, the product is not clear and transparent; the compositions are easy to be layered, and have short-term storage life; in the prior art, a large amount of solubilizers need to be added, so that components are miscible with each other and the storage life can be increased, however the cost is too high and the cells are rough.

Thus it causes damage to the bodies of the workers during construction.

A few types of polyurethane are used in the existing technology, causing the cells to be rough, the adhesion to be poor, the products are crisp and easy to shrink, and it is impossible to give consideration to the intermiscibility, workability and foam property of polyol products.